Journal
PHYSICAL REVIEW LETTERS
Volume 85, Issue 26, Pages 5655-5658Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.85.5655
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We show that within a living eukaryotic cell, mean square displacement of an engulfed microsphere shows enhanced diffusion scaling as t(3/2) at short times, with a clear crossover to subdiffusive or ordinary diffusion scaling at longer times. The motion, observed nearby the nucleus, is due to interactions with microtubule-associated motor proteins rather than thermal Brownian motion. We propose that time-dependent friction introduced by the intracellular polymer networks leads to sub-ballistic motion, analogous to subdiffusion observed in passive networks of semiflexible biopolymers.
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